Baseline data collection: Data collected at baseline will include (with examples), demographics (age, gender, race), substance use history (type of substances used, duration of use, routes of abuse), co-existing medical problems (seizures, hepatitis C), prior mental health problems (prior treatment, diagnoses), prior substance abuse treatment (outpatient, inpatient), socioeconomic variables (educational level, occupation, employment history), criminal history (number of arrests and convictions, total amount of time spent in jail or prison), family history (first degree relatives with substance use disorders) and scores on psychometric testing (DAST, opioid craving score).